Estimation of enhancement timescales of relativistic electrons in the inner magnetosphere using GPS energetic particle observations

Details Estimation of enhancement timescales of relativistic electrons in the inner magnetosphere using GPS energetic particle observations Estimation of enhancement timescales of relativistic electrons in the inner magnetosphere using GPS energetic particle observations

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm42a..02c&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM42A-02

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2774 Radiation Belts, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

The current generation of energetic electron instruments, part of the CXD (combined x-ray dosimeter) package on the GPS satellites, has now been deployed on 5 GPS satellites. Their 12-hour, inclined orbits sample the outer radiation belt from L=4 outward 4 times each orbit, yielding temporal resolution from 75 minutes at L=4 down to 35 minutes at higher L=shells. Preliminary work with fewer GPS satellites for the January 1997 magnetic storms showed fast enhancement timescales of the order of 6 hours or less at L=4 [Reeves et al, 1998]. We will use here the higher temporal coverage of the current GPS constellation to investigate the enhancement timescales at a number of L-ranges between L=4 and L=7. The measurements place direct bounds on the location and type of proposed enhancement mechanisms (in situ heating by waves, radial diffusion). We will investigate here a series of storms observed during the second half of 2004 and first half of 2005. G. D. Reeves, D. N. Baker, R. D. Belian, J. B. Blake, T. E. Cayton, J. F. Fennell, R. H. W. Friedel, X. Li, M. M. Meier, R. S. Selesnick, and H. E. Spence. The global response of relativistic radiation belt electrons to the January 1997 magnetic cloud, Geophys. Res. Lett., 25, 3265-3268, September 1998.

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